Percents & Identifying Numbers

There are two very simple methods on how to convert a decimal to a percentage:

rule of thumb: just always remember to move the decimal two to the right, and sticking a percent sign on the end.
calculator: use the equation: p of (*) d = n (p: percent)
Example: 40 is what percentage of 200?
40 = p * 200      p = 20%



Proportions: ratio = ratio
This technique comes in good handy when you need to double a recipe of any kind. Say a recipe that serves 8 people called for:

• 2 eggs
• 1/4 cup of milk
• 3 cups of flour

You need to double this recipe now; the equation you would make is:
  2 eggs   =    x eggs             x = 4 eggs
8 people     16 people
 ** you can continue this until your recipe is complete
 Identifying Numbers:
 

It can be a little tricky to correctly identify a number, but it can be in more than one category.

* need more assistance?: rational & irrational numbers